package com.zsrt.java.day20161230.lh.day.ex.demo02;

public class MianJi {

	public double a(double r){
		
		return 3.14*r*r;
		
	}

	public double a(double r,double x){
		
		return x*r/2;
		
	}
	
	public double a(double r,int x){
		
		return x*r/2;
		
	}
}
